NEW YORK ( TheStreet) -- Mack-Cali Realty Corporation (NYSE: CLI) is trading at unusually high volume Tuesday with 3.6 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down $1.52 (-4.4%) at $33.10 as of 10:16 a.m. ET. Mack-Cali has a market cap of $2.8 billion and is part of the financial sector and real estate industry. Shares are up 4.7% year to date as of the close of trading on Monday. Mack-Cali Realty Corporation is a real estate investment trust (REIT). It engages in the leasing, management, acquisition, development, and construction of commercial real estate properties in the United States. The company has a P/E ratio of 56, above the average real estate industry P/E ratio of 51.8 and above the S&P 500 P/E ratio of 23.3. TheStreet Ratings rates Mack-Cali as hold. The company's strengths can be seen in multiple areas, such as its increase in net income, reasonable valuation levels and increase in stock price during the past year. However, as a counter to these strengths, we also find weaknesses including disappointing return on equity, poor profit margins and feeble growth in the company's earnings per share. You can view the full Mack-Cali Ratings Report.